20994278 has 8 divisors (see below), whose sum is σ = 33148920. Its totient is φ = 9944640.

The previous prime is 20994271. The next prime is 20994293. The reversal of 20994278 is 87249902.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20994271) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 276203 + ... + 276278.

It is an arithmetic number, because the mean of its divisors is an integer number (4143615).

Almost surely, 2^20994278 is an apocalyptic number.

20994278 is a deficient number, since it is larger than the sum of its proper divisors (12154642).

20994278 is a wasteful number, since it uses less digits than its factorization.

20994278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 552502.

The product of its (nonzero) digits is 72576, while the sum is 41.

The square root of 20994278 is about 4581.9513310379. The cubic root of 20994278 is about 275.8673573235.

The spelling of 20994278 in words is "twenty million, nine hundred ninety-four thousand, two hundred seventy-eight".